Sharpening attachment for cloth-cutting machines.



H. MAIMIN.

SHARPENTNG ATTACHMENT FOR CLOTH CUTTING MACHINES.

v APPLICATTON FILED JUNE 15. 1914.

Patented Apr. 1918.

Z SHEETS-SHEET I 59 V ATTORNEYS H. MAIMIN.

SHARPENING ATTACHMENT FOR CLOTH CUTTING MACHINES.

APPLICATION FILED JUNE 16. 1914.

Patented Apr. 23, 1918;

2 SHEETS-SHEET 2.

nvmaiv maintain, or new irons, iv. v.

SHARPENING ATTACHMENT FOR CLD TH CUTTING MACHINES.

To all whom it may concern Be it known that I, HYMAN MAIMIN, a citizenof the United States, residing in the borough of Manhattan, city,county, and State of New York, have invented certain new and usefulImprovements in Sharpening Attachments for Cloth-Cutting Machines; and Ido hereby declare the following to be a full, clear, and eXactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

Cloth cutting machines having rotary cutting knives are commonlyequipped with knife-sharpening grinders adapted to be brought .intogrinding engagement with the cutting edge of the knife at the will ofthe operator, in order that the knife may be continuously kept at a highpoint of cuttting eiliciency. These grinders commonly consist of a pairof rotatable grindstones positioned on opposite sides o-f the edge ofthe cutting blade and so mounted that they lie normally out ofengagement with the edge of the blade, but may readily be brought intocontact therewith when necessary or desirable. The capacity of thegrindstones to produce a proper cutting edge on the knife depends uponthe proper setting of the stones with relation to the knife edge. Thatis to say, there is a certain best position in which the sweep of theknife edge along and across the preferably conical surfaces of thestones produces the most effective cloth-cutting edge; and the purposeof the present invention is to provide an arrange ment such that thiscorrect position, having been initially established, will always bemaintained as the knife edge of the stone surfaces wear away, it beingunderstood that the stones are, as usual, normally out of engagementwith the knife but capable of being brought into contact therewith whennecessary or desirable.

To this end, the sharpening grinder, preferably consisting as usual oftwo grindstones on opposite sides of the knife-edge and having conedsurfaces for engagement therewith, are arranged to move from adisengaged position to a sharpening engagement with the cutting edge bya movement of translation along a straight line in a directionsubstantially radial of the knife disk, so that, as the diameter of theknife is reduced by wear, the proper relative position of thegrindstones with respect to the Specification of Letters Patent.

3 Application filed June 16, 1914.

Patented Apr. 23, 1913..

serial no. 845,355.

knife edge will be maintained. Furthermore, the direction of movement ofthe in- CliViClHzLl stones is preferably along lines which convergetoward the plane of the knife, so that as the stones wear down,coincidentally with the wearing down ofthe knife, they will automaticallmove inwardly toward the knife edge. rovision is also made, in thepreferred form of the invention, for an additional adjustment of thegrindstones toward ,and away from each other laterally of the knife toperfect the ii'ntial adjustment for any particular blade.

In the accompanying drawings, illustrating the preferred embodimentwithin my invention,

Figure 1 is a side elevation of the cutting machine 2 is a section online 2-2 of Fig. 1;

Fig. 3 is a vertical central section on an enlarged scale;

Fig. 4 is a section on line l-4 of Fig. 3; and

Fig. 5 is a section on line 5-5 of Fig 1.

In the drawings, the motor 1 and the recessed standard 2 upstanding fromthe base 3, the directing handle 4, the electrical switch 5 and theguard 6 in front of the knife, are, in general, similar to thedisclosure in the United States patent to Morton Arendt No. 1,125,434 ofJanuary 19, 1915. The vertically disposed driving motor shaft 7 carriesthe bevel pinion 8 meshing with the bevel gear 9 rotatably mounted onball bearings on the hub 13 to which the knife disk 14 is clamped by thecap 16.

The two grindstones 20 are mounted for rotation on studs which comprisesliding portions 21 having feathers 22 engaging grooves in the guides23, and also having journal portions 24: bent upwardly at differentangles to bring the stones into sharpening engagement with the two sidesof the knife at circumferentially separate places. The axes of thesliding portions are directed from the circumference toward the axis 13of the cutting knife substantially radially thereof, and inwardly towardthe plane of the knife in converging lines. In this way, effectivesharpening engagement occurs between the grindstones and the knifeirrespective of the worn diameter of the knife. The guides 23 aremounted on a rod 25 supported in the standard 2 and are adjustabletoward each other by means of the adjusting screws 26 threaded into theends of the rod 25, and away from each other by means of the springs 27coiled around the rod between the guides and a top extension of thestandard 2. Lock screws 19 are provided to secure the guides in theiradjusted positions.- Thus the grindstones may be moved laterally of theknife to produce the most effective initial sharpening engagement withany particular knife blade.

The mechanism for moving the grinders from their normal position awayfrom the knife to the position of sharpening engagement therewith,comprises, in addition to the guiding devices previously described, thelever mechanism consisting of the handle lever 29 located in proximityto the directing handle a of the machine for convenient manipulation bythe finger while still grasping the directing handle, and also a bentlever 30 pivotally connected at 31 to the handle lever 29 and at 32tothe wedge shaped cam 33 (see Figs. 4: and 5). This cam rests betweenthe stationary cam member 34 and, the roller 35 mounted in bearings inthe sliding portions 21 of the studs. Upon pulling the handle 29 towardthe directing handle, the cam 33 presses against the roller 35 and thusmoves the grinders 20 in their guided direction to sharpening engagementwith the cutting edge of the knife. Upon releasing the handle 29, thelever mechanism is returned by the spring 36, while the studs on whichthe grindstones are mounted for rotation are returned to their normalposition ofdisengagement by means of the springs 37. 7

Having thusdescribed my invention, what I claim is:

1. In a cloth cutting machine, .a rotatable cutting knife, a sharpeninggrinder normally disengaged from the knife, and lever mechanism designedto impart to the 'rinder a movement of translation inv a straight lineand in a substantially radial direction to ward the axis of the knifeintosharpening engagement with the cutting edge.

- 2. In a cloth cutting machine, a rotatable cutting knife, a sharpeninggrinder normally disengaged from the knife, and lever mechanism designedto impart to the grinder a movement of translation in a straight lineand in a substantially radial direction to ward the aXis of the knifeand inwardly toward the plane thereof into sharpening engagement withthe cutting edge.

3. In a cloth cutting machine, a rotatable cutting knife, a pair ofsharpening grindstones arranged on the two sides of the knife normallyout of engagement therewith, and mechanism designed to impart to thegrindstones movements of translation on converging straight linessubstantially ra- Gopies of this patent may be obtained for dially ofthe knife into sharpening engagement with both sides of the cuttingedge.

4. In a cloth cutting machine, a rotatable cutting knife, a sharpeninggrinder normally disengaged from the knife, a guide for the grinderradially arranged with respect to the knife, and lever mechanism formoving the grinder into sharpening engagement with the cutting edge ofthe knife.

5. In a cloth cutting machine, a rotatable cutting knife, a pair ofsharpening grindstones normally disengaged from the knife, guides forthe stones radially arranged with respect to the knife, mechanism forsimultaneously moving the stones in the guides into sharpeningengagement with the cutting edge of the knife, and mechanism foradjusting the guides laterally of the knife.

6. In a cloth cutting machine, a rotatable cutting knife, a pair ofsharpening grindstones normally disengaged from the knife,

guides for the stones radially arranged with respect to the knife andset on converging lines, mechanism for simultaneously moving the stonesin the guides into sharpening engagement with the cutting edge of theknife, and mechanism for ad usting the guides laterally of the knife.

7. In a cloth cutting machine, a rotatable cutting knife, a pair ofsharpening grindstones arranged on the two sides of the knife normallyout of engagement therewith and mounted for movements of translation onconverging straight lines substantially radially of the knife intosharpening engagement with both sides of the cutting edge, and meanscommon to the two grindstones for simultaneously moving both of the sameinto sharpening engagement with the knife.

8. In a cloth cutting machine, a rotatable cutting knife, a sharpeninggrinder normally disengaged from the knife, :1 guide in which saidgrinder is mounted for radial movements with respect to the knife towardand away therefrom, lever mechanism for so moving the grinder in theguide, and mechanism for adjusting the guide laterally of the knife.

9. In a cloth cutting machine, a rotatable cutting knife, a sharpeninggrind-stone normally disengaged from the knife, a guide for the stoneradially arranged with respect; to the knife and inclined toward theplane of the knife, means for moving the grindstone in said guide, andmeans for adjusting the guide laterally of the knife.

In testimony whereof I aiiix my signa ture in presence of two witnesses.

IIYMAN MAIMIN.

Witnesses:

L. BATES M. A. BILL,

five cents each, by addressing the Commissioner of Patents, Washington,D. G,"

